Rc Filter Circuit Theory. Rc circuits can be used to filter a signal by blocking. Rc low pass filter circuit fig.
At the angular frequency ω ω o 1 rc the capacitive reactance 1 ωc equals the resistance r. To create a low pass rc filter the resistor is placed in series to the input signal and the capacitor is placed in parallel to the input signal such as shown in the circuit below. A resistor capacitor circuit rc circuit or rc filter or rc network is an electric circuit composed of resistors and capacitors it may be driven by a voltage or current source and these will produce different responses.
The output voltage of an rc low pass filter can be calculated by treating the circuit as a voltage divider consisting of a frequency independent resistance and a frequency dependent reactance.
The voltage across the series combination is iz rc i r 2 1 ωc 2 1 2 so the gain is. The voltage across the series combination is iz rc i r 2 1 ωc 2 1 2 so the gain is. 1 shows the series rc lp circuit. However the behavior totally differs from that of the high pass circuit.
